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2(9x²-12x+4)-9x+6=0
18x²-24x+8-9x+6=0
18x²-35x+14=0
Δ=1225-1008=217
x₁= (35-√217)/36
x₂=(35+√217)/36
b) x⁴ -13x²+36=0
x²=t
t²-13t+36=0
Δ=169-144=25 √Δ=5
t₁= 4
t₂= 9
x²=4 ∨ x²=9
x=2 ∨ x=-2 ∨ x=3 ∨ x=-3
c)x⁶ +11x³ -12=0
x³=t
t²+11t-12=0
Δ=121+48=169 √Δ=13
t₁= 1
t₂= -12
x=1 ∨ x= - ∛12
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